854778422520 has 384 divisors, whose sum is σ = 3187285770240. Its totient is φ = 196646123520.

The previous prime is 854778422503. The next prime is 854778422539. The reversal of 854778422520 is 25224877458.

It is a happy number.

854778422520 is a `hidden beast` number, since 8 + 5 + 4 + 7 + 78 + 42 + 2 + 520 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11530212 + ... + 11604108.

It is an arithmetic number, because the mean of its divisors is an integer number (8300223360).

Almost surely, 2^854778422520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 854778422520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1593642885120).

854778422520 is an abundant number, since it is smaller than the sum of its proper divisors (2332507347720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

854778422520 is a wasteful number, since it uses less digits than its factorization.

854778422520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74075 (or 74068 counting only the distinct ones).

The product of its (nonzero) digits is 10035200, while the sum is 54.

The spelling of 854778422520 in words is "eight hundred fifty-four billion, seven hundred seventy-eight million, four hundred twenty-two thousand, five hundred twenty".